E-PolyLearning

1. The behaviour of visco-elastic material is time dependent. This behaviour is common in __________ materials.
a. non-crystalline solid
b. crystalline
c. rubberry
d. non-crystalline organic polymeric.
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Answer: (d).non-crystalline organic polymeric.

2. Coke oven regenerators are made of __________ bricks.
a. fire clay
b. silica
c. low thermal conductivity
d. high electrical conductivity
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Answer: (a).fire clay

3. Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (1/20th of ordinary metals) ?
a. Invar
b. Constantan
c. Chromel
d. Alumel
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Answer: (a).Invar

4. The purpose of nitriding the steel is to
a. harden its surface.
b. soften its surface.
c. improve its reliability.
d. none of these.
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Answer: (a).harden its surface.

5. Sulphur melting pit in the sulphuric acid plant is made of
a. lead lined stainless steel.
b. cast iron.
c. steel or cement-brick lined.
d. hard wood.
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Answer: (c).steel or cement-brick lined.

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